The attempted attack by an armed gunman aboard a high-speed train in Europe on Friday may push the Continent into a new climate of uncertainty, security experts fear, because of the nearly impossible task of monitoring all suspected militants.

• Violent clashes between thousands of protesters and the police broke out in Beirut, Lebanon. The protesters are angry about the government’s inability to remove enormous heaps of garbage from the streets.

• The Chinese writer Liu Cixin has won the 2015 Hugo Award for best science-fiction novel, a first for a Chinese writer. “The Three-Body Problem” is the first volume of a trilogy that has been a best seller in China.

Many people believe the source of this myth was a 1945 Food and Nutrition Board recommendation that said people needed about 2.5 liters of water a day. But they ignored another sentence: “Most of this quantity is contained in prepared foods.”

• “Bemusement park” opens.

The British graffiti artist Banksy’s latest creation is a satirical take on theme parks called “Dismaland,” featuring works by about 60 artists. We went for a visit.

Buyers lined up at midnight at computer stores across the U.S.; an ad campaign featured the Rolling Stones’s “Start Me Up,” at a cost of millions of dollars; the Empire State Building shined colored lights for a business for the first time; the front page of The Times of London carried Windows 95 ads...

All of this for a product that, as one pundit put it, doesn’t really do anything on its own.

Yet in hindsight, Windows 95 was such a breakthrough in personal computing that some of the hype was probably unnecessary for an upgrade to an operating system that went on to capture 97 percent of the global computer market.

Noting its simple interface, one midnight shopper said at the time, “Windows 95 is to computing what color TV was to black and white TV.”

It also prominently featured software for easy access to the Internet.